re: Need help. If the center of the earth is so hot why is the bottom of the ocean so cold?

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Imma say it's because the center of the Earth is over 47,000,000 feet from the sea level surface and the deepest known point in any ocean is only 35,000 feet from the sea level surface.

In other words, the bottom of the ocean still isn't very close to the center of the Earth.

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It doesn't have to be close to the center to be hot. Drill down mine shafts deep enough and it gets pretty toasty, and those are barely scratching the surface of the crust much less the mantle much less the core.